public override Task <Entity> CreateEntity(EntityHierarchyItemViewModel parent)
{
var name = ComputeNewName(parent, "Smoke particle system");
var component = new ParticleSystemComponent();
var emitter = new ParticleEmitter {
ParticleLifetime = new Vector2(1, 2)
};
// 20 Particle per second
var spawner = new SpawnerPerSecond {
SpawnCount = 20
};
emitter.Spawners.Add(spawner);
// Size
var randSize = new InitialSizeSeed {
RandomSize = new Vector2(0.35f, 0.55f)
};
emitter.Initializers.Add(randSize);
// Position
var randPos = new InitialPositionSeed
{
PositionMin = new Vector3(-0.2f, 0, -0.2f),
PositionMax = new Vector3(0.2f, 0, 0.2f)
};
emitter.Initializers.Add(randPos);
// Velocity
var randVel = new InitialVelocitySeed
{
VelocityMin = new Vector3(-0.5f, 1f, -0.5f),
VelocityMax = new Vector3(0.5f, 3, 0.5f)
};
emitter.Initializers.Add(randVel);
component.ParticleSystem.Emitters.Add(emitter);
return(CreateEntityWithComponent(name, component));
}
public void EmitterUpdate()
{
var emitter = new ParticleEmitter();
var dummyParticleSystem = new ParticleSystem();
const float dt = 0.0166666666667f;
// Updating the emitter forces the creation of a default spawner (100 particles per second)
emitter.Update(dt, dummyParticleSystem);
var forceField = new UpdaterForceField();
emitter.Updaters.Add(forceField);
var positionSeed = new InitialPositionSeed();
emitter.Initializers.Add(positionSeed);
var velocitySeed = new InitialVelocitySeed();
emitter.Initializers.Add(velocitySeed);
// Fixed delta time for simulating 60 fps
var totalTime = 0f;
// Simulate 10 seconds
while (totalTime < 10)
{
emitter.Update(dt, dummyParticleSystem);
totalTime += dt;
}
emitter.Updaters.Remove(forceField);
// Simulate 10 seconds
while (totalTime < 10)
{
emitter.Update(dt, dummyParticleSystem);
totalTime += dt;
}
emitter.Initializers.Remove(positionSeed);
// Simulate 10 seconds
while (totalTime < 10)
{
emitter.Update(dt, dummyParticleSystem);
totalTime += dt;
}
emitter.Updaters.Add(forceField);
emitter.Initializers.Add(positionSeed);
// Simulate 10 seconds
while (totalTime < 10)
{
emitter.Update(dt, dummyParticleSystem);
totalTime += dt;
}
// The emitter update doesn't assert anything as the state of the particle system will be difficult to predict
// Such tests will be part of the GraphicsTests
}